Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Corrosion Products and Desalting Treatments of Copper and Copper Alloy (Bronze)

동(Cu) 및 동합금(Bronze)의 부식생성물과 탈염처리

  • Kim, Sang-Beoum (Department of Materials Engineering, Yonsei University) ;
  • Kim, Hyun-Cheol (Department of Materials Science and Engineering, Yonsei University) ;
  • Park, Hyung-Ho (Department of Materials Engineering, Yonsei University)
  • Published : 2010.02.27
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Abstract

Benzotriazole (B.T.A) which has been mainly used for the stabilization processing method of excavated copper and bronze artifacts is vaporized within 2~3 years after the usage because it is unstable at the acid conditions and cannot protect the surface of artifacts. In this study, NaOH method which has been used for the steel artifacts was applied as a stabilization process for the method of copper and bronze artifacts to gush chlorine ion out. For the reproduction of excavated samples, copper and bronze plates were dipped in 0.1M HCl for 26 hrs to form CuCl, rusted at $70^{\circ}C$ with RH 75% for the formation of corrosion products, and desalted in 0.1 M NaOH solution. The concentration of chlorine ion was measured by using ionchromatography. During the desalting process, a large quantity of chlorine ions was gushed out in early period and corrosion products were not additionally generated through the re-corrosion experiment. This NaOH desalting process was found to be a method of stabilization process for copper and bronze artifacts from the formation of Tenorite (CuO) during desalting as a protection layer for corrosion.

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